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We have recently rolled out Exchange 2013 + Outlook 2013 across our business, and have just finished migrating users over to this. One of our machine which has 20GB Email (automated emails for logging) takes ages when creating a rule within either Outlook (when you click Add it says Updating Folders... and takes over 10 minutes per rule.

Running the same process through OWA takes about 5-10 minutes per rule that we try and create (there are currently around 250 rules already).

My query is:

  • Is this due to the amount of email, or number of current rules (or a mixture of both)?
  • Is there any way to resolve this, or has anybody else encountered this?

Thanks in advance

  • Having created many rules in my relatively new mailbox all on the same day, I can say that the number of rules on the mailbox is what made my rule creation process slow down. The first five rules I created didn't take that long. Each rule after that point took longer and longer and longer to finish creating. I have about 20 rules and I just stopped creating them and I sort some of my mail manually. Sadly I haven't come up with a workaround or mitigation for the issue yet. Oh yeah my exchange server is actually Office 365, so it might be more of an Outlook issue. – Todd Wilcox Jan 9 '18 at 20:17
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That's a pretty unusual environment: tons of rules and very large mailbox sizes. Outlook performance deteriorates hard when you have more than 5-10K items in a single folder. The item size is irrelevant; the item count is what matters. You might get better performance from using the New/Get/Set-InboxRule cmdlets.

  • This information is correct (although I think Microsoft claims to have reduced or fixed the performance issue over 10k items in later version of Outlook), but I have the same experience in an inbox with only 2,600 items, so I'm not sure the item count is related to the rule creation performance issue.. – Todd Wilcox Jan 9 '18 at 20:14

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