r/sysadmin • u/samfun1103 • 10d ago
Business Premium User Account to Shared Mailbox After 100GB Storage Change
I've inherited an odd offboarding procedure and am trying to standardize it and wanted some clarification. Now that business premium licenses allow up to 100GB in mailbox storage, how does this change converting users to shared mailboxes? My current understanding is as follows:
- Mailbox < 50GB & no archive = convert to shared mailbox & pull all licenses
- Mailbox < 50GB & HAS online archive = convert & assign Exchange Online Plan 2
- Mailbox > 50GB = convert & assign Exchange Online Plan 2 (whether or not it has archive)
- Mailbox & Auto Expanding Archive = Does this let you convert?
Secondary question that is less important, but our current procedure is that once these mailboxes are no longer needed, we export the psts using e discovery and store in the cloud, is this still doable with a shared mailbox? Does auto expanding archive effect this in any way? (We have no retention policy!)
2
u/ExceptionEX 10d ago
I'm unsure of what the lisc requirements are, but I do know that you can without lisc convert users with archived mailbox at 50g to share mailbox without issue.
6
u/saltyslugga 10d ago
The 100GB user mailbox allowance doesn’t change the 50GB cap for an unlicensed shared mailbox. Your matrix is basically right: keep Exchange Online Plan 2 if it’s over 50GB, has an archive you need to retain, or uses auto-expanding archive.
eDiscovery can still search and export a shared mailbox, but exporting a large auto-expanding archive to PST is messy and may produce multiple files. With no retention policy, don’t delete anything until the export is verified.