[EXO] Inbox Rule Issues Post Migration

In some instances, users with client side rules may  break as they do not get touched in the migration. For any client rules that reference a specific sender/folder/etc they will normally use X500/LegacyDN to identify conditions and will stop working.

  • There is no set limit for the amount of Inbox rules a user can have.
  • The amount of rules is dictated more ever by the rule size limit and limited to 256 KB total for all rules.

Each rule you create will take up space. The actual amount of space a rule uses depends on several factors, such as how long the name is and how many conditions you’ve applied. When you reach the 256 KB limit, you’ll be warned that you can’t create any more rules or that you can’t update a rule. You can’t increase the amount of space that’s allocated to store Inbox rules in Exchange Online, but you can decrease it to suit your business needs.

  • There is no way to calculate the size for all rules (avg around 3kb for a basic rule)

https://docs.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/outlook-on-the-web/increase-the-space-used-by-inbox-rules)

Options:

  • Recreate their rules entirely. Allows user to reorganize and customize their inboxes to their preference.
  • Audit, review, and consolidate rules by exporting using below cmdlet:

 

epic
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