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Adding new Exchange (2016) rule very slow down Microsoft Outlook


New Member
Outlook version
Outlook 2016 32 bit
Email Account
Exchange Server
1 down vote favorite

We have recently rolled out Exchange 2016 + Outlook 2016 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 450 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