Stop paying to keep dead mailboxes alive.
Every employee who leaves and keeps a mailbox licence "just in case" is a subscription that never gets cancelled. Enter your headcount and churn below to see what your zombie mailboxes cost today, and what the same mailboxes would cost on Evermail instead.
Defaults to a typical Microsoft 365 Business Basic / Google Workspace Business Starter seat kept active for a leaver (~€5.60-5.75/mo). Downgrading to an archive-only tier, such as Google's Archived User licence, can lower this to roughly €3.40/mo - it still never stops billing.
Assumes archived mailboxes average ~2 GB each, so bigger archives may need a larger Evermail plan. See full methodology and sources ↓
What companies actually do with leaver mailboxes
| Approach | Typical cost | Searchable | Stops billing? |
|---|---|---|---|
| Keep the M365/Google licence active | €5.60-5.75/user/mo | Yes, in the native mail client | No — bills forever |
| Downgrade to an archive-only tier | ~€3.40/user/mo | Limited, native admin tools only | No — still bills forever |
| Delete the account, keep a PST/MBOX on a drive | €0 licence, unmanaged risk | No — unsearchable, no access control | Yes, but data is effectively lost |
| Evermail (one flat plan, unlimited leaver mailboxes) | From €9/mo total, not per leaver | Full-text search, contacts, exports | Yes — cancel the seat licence entirely |
How this calculator works
Zombie mailboxes today = headcount × annual churn % × the number of years you tell us unused licences typically sit before someone reviews and cancels them. Most companies never run that review proactively, which is exactly why this number compounds year over year.
You're paying = zombie mailboxes × your per-seat monthly cost × 12. The €5.60/mo default reflects Microsoft 365 Business Basic and Google Workspace Business Starter list pricing for a seat kept active after someone leaves. If your company already downgrades leavers to a cheaper archive-only tier (for example Google's Archived User licence, roughly €3.40-7/user/mo depending on your base plan), enter that number instead - the seat still never stops billing, it's just cheaper.
With Evermail assumes an average archived mailbox size of ~2 GB (text plus attachments) and picks the smallest Evermail plan that fits: Pro (€9/mo, unlimited mailboxes, 20 GB) for smaller archives, Team (€29/mo, unlimited mailboxes, 50 GB, up to 5 staff seats) for most SMBs, and Enterprise (from €149/mo, 100 GB per user) for large or multi-department archives. This is a flat fee regardless of how many leaver mailboxes you store, unlike a per-seat licence.
Sources: Google Workspace and Microsoft 365 published list pricing for standard seats; Google Workspace Archived User licence pricing (varies roughly €2-7/user/mo by base plan tier); Microsoft 365 Archive storage overage pricing on Microsoft Learn. Your actual contract pricing may differ from public list prices - use your own numbers in the "current cost per zombie mailbox" field above for an exact result.
Built for IT admins who inherited the zombie mailbox problem
One flat plan. Every leaver's mailbox stays searchable. No per-seat licence to babysit.
Common questions
How accurate is this calculator for my company?
Do I need one Evermail seat per zombie mailbox?
What happens to compliance and legal hold requirements if I cancel the licence?
Where do the comparison numbers come from?
Can I try Evermail before moving budget away from my current licences?
Your zombie mailboxes are billing you again this month.
Move them to Evermail and pay a flat fee instead of a licence per leaver.
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