Hey everyone! I've noticed that the mailboxes we've created—both user and shared in our Microsoft 365 environment—are set to a 20GB limit. However, if I'm not mistaken, shared mailboxes can go up to 50GB without needing a license, and licensed users can have even more depending on their subscription. I'm curious if in your setups, shared mailboxes usually default to 50GB? Given that we're working in a hybrid model, I'm wondering if this 20GB limitation was inherited from previous settings. If we decide to increase all mailboxes to 50GB across our domain, what should we consider? We typically use Outlook in cached mode but disable caching for shared mailboxes. Just to clarify, I'm not looking to push any mailbox beyond 50GB, as I know that can cause issues with Outlook. Thanks a bunch!
2 Answers
Mailbox sizes really depend on the user's role. Office staff who rely on Outlook a lot usually get 50GB, whereas frontline workers with an F3 license may only need 2GB. It's best to assess the mailbox size based on the role rather than applying a blanket rule for everyone.
Just a heads up, the primary device can’t have a screen larger than 10" if you’re using that F3 license.
To get your mailboxes upgraded, you can run this command: Get-Mailbox -ResultSize Unlimited | Set-Mailbox -ProhibitSendQuota 49GB -ProhibitSendReceiveQuota 50GB -IssueWarningQuota 45GB. For future mailboxes, you’ll want to set the mailbox plan like this: Get-MailboxPlan | Set-MailboxPlan -ProhibitSendQuota 49GB -ProhibitSendReceiveQuota 50GB -IssueWarningQuota 45GB.
Thanks for the insight, BrennanSB!