Key Takeaways
- Most small San Diego offices pay roughly $50 to $150 per user for a basic migration.
- Mailbox size, old file servers and custom apps move the price more than headcount does.
- A fixed written quote after a short assessment beats an open hourly estimate.
- Licenses are a separate monthly cost from the migration project itself.
- Cleanup and training are the two line items most often left out of cheap quotes.
If you are asking what an Office 365 migration costs in San Diego, the short answer is that it depends on three things: how many people you have, how much data they hold, and what you are moving from. A five-person office with clean Google or Exchange mailboxes is a small job. A 60-person firm with a decade of files on a server in a closet is a project. Both are normal, and both can be priced fairly.
This guide gives you typical ranges, not promises. Prices change with the provider, the season and the state of your current setup. What stays steady is the way the work is built up, so you can read any quote and see what is in it and what is missing. If you want a provider to carry out the work, our Office 365 support team can run the whole project and then look after it afterward.
Everything below is written for owners and office managers, not IT staff. You will see what a per-user price covers, which extras show up late, and which questions to ask before you sign. If you only read one section, read the one on hidden costs.
Typical Office 365 Migration Costs in San Diego
Most migration quotes come in one of two shapes. Some are priced per user, which is common for email-only moves. Others are priced as a fixed project, which is common when files, shared drives and devices are involved. Neither is better. What matters is that the quote lists what is included.
The ranges below are what most San Diego small and mid-size businesses typically see. They assume a normal setup with no unusual software and a provider who plans the cutover in advance. Treat them as a starting point, then ask for a written number once someone has looked at your real environment.
| Office Size | Typical Migration Price | Typical Timeline |
|---|---|---|
| 1 to 10 users | $500 to $2,000 total | 1 to 3 days |
| 11 to 25 users | $1,500 to $5,000 total | 1 to 2 weeks |
| 26 to 50 users | $4,000 to $10,000 total | 2 to 4 weeks |
| 51 to 100 users | $8,000 to $20,000 total | 3 to 6 weeks |
| 100+ users or multiple sites | Quoted per project | 6 weeks or more |
Notice that price per user falls as the office grows. Setup work such as planning, domain changes and security settings is mostly the same whether you have 10 people or 40. That fixed effort is spread across more seats.
Most small offices can review a written migration quote in a single sitting.
Cost Per User vs. Cost Per Project
Per-user pricing is easy to compare. A typical email-only move runs about $50 to $150 per mailbox, depending on how large the mailboxes are and where they come from. That price usually covers copying mail, calendars and contacts, switching your domain over and checking that Outlook works on each computer.
Per-project pricing makes more sense once you add files. Moving a shared drive into SharePoint or OneDrive means mapping folders, setting permissions and cleaning out years of duplicates. That work does not scale per person. It scales with the amount and the mess of the data, so a flat project fee is often the clearer deal.
- Per user works best for email-only moves with clean source systems.
- Per project works best when files, permissions or several sites are involved.
- Hourly billing is the riskiest option unless the provider caps the total.
- A hybrid quote, a project fee plus a per-user rate for extras, is common and fair.
Whichever model you pick, ask the provider to write down the number of mailboxes, the amount of data and the number of devices they assumed. If any of those change, you will know exactly why the price moved.
What Drives Your Migration Price Up or Down
Headcount is only part of the story. Two offices with 20 people can get very different quotes. The differences come from the condition of what you are moving and from how much support you want around the move.
- Data volume. A mailbox holding 40 GB takes longer than one holding 4 GB. Large archives and old PST files add real hours.
- Source system. Moving from Google Workspace or hosted Exchange is usually simpler than moving from an aging on-site server.
- File shares. Every shared folder needs a plan for where it lands and who can open it. Messy permissions cost time to untangle.
- Custom software. Line-of-business apps that connect to email or to a file server may need testing, and sometimes vendor help.
- Security setup. Multi-factor sign-in, conditional access and device rules add setup time. They are also what you most want right.
- Timing. Evening and weekend cutovers, which keep your staff working, can carry a modest premium.
A good provider spots most of these in a short assessment. That is why a quote written before anyone has looked at your setup should be treated as a guess, not a price.
An aging on-site mail server is one of the most common reasons a San Diego office moves to Microsoft 365.
Microsoft 365 License Costs Are Separate
Do not confuse the migration fee with the monthly license. The license is what you pay Microsoft, usually through your provider, for each user every month. The migration is a one-time project that gets you onto that license. Many quotes bundle them in a way that makes both look cheaper than they are, so ask for them on separate lines.
Monthly licenses for most small businesses fall in a typical range of about $6 to $23 per user, depending on the plan. The lower end covers web apps and email. The higher end adds desktop apps, stronger security and device management. Which plan fits depends on how your staff work and what you must protect.
| Plan Type | Typical Monthly Cost Per User | Who It Usually Fits |
|---|---|---|
| Basic (web apps, email) | About $6 to $8 | Field staff, part-timers, shared mailboxes |
| Standard (desktop apps) | About $12 to $14 | Most office workers |
| Premium (added security) | About $20 to $23 | Teams with sensitive client or patient data |
Pick plans by role, not by habit. A front-desk worker and a partner rarely need the same license. Matching plans to roles can lower your monthly bill without losing anything your people actually use.
Hidden Costs to Ask About Before You Sign
The cheapest quote is rarely the cheapest result. Several tasks are easy to leave out, and you only notice when the work is already underway. Ask each provider whether the items below are in the price or billed on top.
- Cleanup of old, duplicate or abandoned mailboxes and files before the move.
- Outlook profile setup and repair on every computer, not just the main ones.
- Moving shared mailboxes, calendars and distribution lists.
- Retention and archive rules, if your industry requires you to keep records.
- Multi-factor sign-in setup and a short check of your security settings.
- Staff training, even a 30-minute walk-through for each team.
- Post-move support for the first one to two weeks.
Training and post-move support matter more than owners expect. The technical part may finish on a Friday night. The real test is Monday morning, when everyone opens Outlook and finds something slightly different. A plan that includes help for that first week saves you a lot of interrupted work.
The first Monday after a cutover is when most small questions come up, so plan help for that day.
Three San Diego Examples
Real offices make the ranges easier to picture. These are illustrative, not quotes, and they show how the same price drivers play out in different San Diego businesses.
A 12-Person Architecture Studio in Little Italy
The studio runs hosted email and keeps large drawing files on a small file server. The mailboxes are modest, but the project files are big. The email move is simple. The file move needs careful planning so people can still open large models quickly. A fair result is a fixed project price in the lower thousands, with a short training session.
A 35-Person Distributor Near Kearny Mesa
This team uses an older on-site Exchange server and a shared drive that has grown for years. The cost leans toward cleanup and permissions. Expect a project price in the mid thousands, an evening cutover and a week of help afterward so the warehouse and the office both stay productive.
A 70-Person Biotech Firm Near Torrey Pines
Here the security setup drives the price. Multi-factor sign-in, device rules and retention policies matter to partners and auditors. The migration lands in the five-figure range, but the extra spend buys documented controls the company will need anyway.
How to Compare Migration Quotes
Quotes are easier to compare when they follow the same outline. Ask each provider to fill in the same few lines, and the real differences show up fast. Lower numbers often hide missing pieces, while higher numbers often include work you would have had to buy later.
| Quote Line | Giga San Diego | Typical Lowest Bidder | Typical Large Reseller |
|---|---|---|---|
| Price format | Fixed written quote | Low hourly estimate | Project fee plus change orders |
| Pre-move assessment | Included | Often skipped | Sometimes billed separately |
| Cleanup of old data | Scoped up front | Excluded | Optional add-on |
| Evening or weekend cutover | Planned in advance | Extra charge | Extra charge |
| Staff training | Short walk-through included | Not offered | Billed per session |
| Post-move help | First weeks covered | Billed hourly | Limited window |
| Ongoing support | Available after the move | Rarely offered | Separate contract |
Do not pick on price alone. Pick the quote that names what is included, states what could change the number and tells you who answers the phone on cutover night.
Related Costs Worth Planning For
A migration touches more than email. If you plan to move shared files into a team workspace, your SharePoint services budget should sit alongside the migration line. Setting up sites and permissions properly the first time costs less than fixing a tangled structure a year later.
If your starting point is a different mail platform, the price of the mailbox move itself depends heavily on the source. Our notes on email migration services explain how each source system changes the work. Both topics are easier to price once you have a clear count of users, mailboxes and data.
Last, remember that Microsoft 365 does not back itself up in the way many owners assume. Budget a small monthly amount for backup. It is inexpensive compared with the cost of one deleted folder that nobody can recover.
A short assessment lets a provider turn a rough range into a firm written number.
An Office 365 migration is one of the more predictable IT projects you will buy. The ranges are well known, the main price drivers are easy to name, and a short assessment turns a wide estimate into a firm number. If your quote cannot be explained in a few plain lines, ask for a clearer one.
Start with a free IT assessment. A technician reviews your mailboxes, files and computers, tells you what the move will involve and gives you a written quote with no pressure. You can then compare it with any other offer on equal terms.
FAQs
How much does an Office 365 migration cost for a small San Diego business?
Most offices with 1 to 25 users typically pay about $500 to $5,000 total, depending on mailbox size and whether files move too. Email-only moves from clean systems sit at the low end. File servers, cleanup and extra security setup push the price higher.
Is the migration price per user or per project?
Both exist. Email-only moves are often quoted per mailbox, roughly $50 to $150 each. Moves that include file shares, permissions or several sites are usually a fixed project fee. Ask for the number of mailboxes and the data volume the quote assumes.
Are Microsoft 365 licenses included in the migration cost?
Usually not. Licenses are a monthly cost for each user, typically about $6 to $23 depending on the plan. The migration is a one-time project on top of that. Ask for both on separate lines so you can compare quotes fairly.
How long does a migration take?
A small office can finish in one to three days. A 25 to 50 person company with file shares often needs two to four weeks, including planning and testing. The cutover itself is usually done in the evening or over a weekend so work is not interrupted.
Will my staff lose email or files during the move?
They should not. A proper migration copies data first, tests it, then switches your domain. Your old data stays in place until you confirm everything works. Ask your provider how they verify the copy and whether a rollback plan is included.
What hidden costs should I watch for?
Common ones are data cleanup, Outlook setup on each computer, shared mailbox moves, security configuration, training and post-move support. Cheap quotes often leave these out. Ask each provider to confirm in writing which items are included.
Tyler Navarro
Editorial Director, Giga San Diego
Tyler runs the Giga San Diego editorial desk and turns what our technicians see every week, from Santa Ana wind outages to office moves along I-5, into practical guides for San Diego business owners. He grew up in the county and has spent more than 15 years in IT services, starting on a help desk in Kearny Mesa and later leading network and support projects for biotech firms, clinics, logistics companies and defense suppliers. He holds Microsoft 365 and CompTIA Security+ certifications. Lately he focuses on how AI tools such as Microsoft Copilot can help small teams without exposing sensitive data, and every guide he writes is reviewed by a working technician before it goes live.