exchange 2013 | outlook online mode
When running outlook in online mode, is it more memory intensive or CPU intensive on the exchange server?
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Is it more CPU or memory though? I have read that exchange caches the requests from outlook in online mode in memory, meaning that it's more memory intensive than CPU?
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That is correct. When you are using Online mode you are actually using more resources on your client machine and also the Exchange server. This is because your client has a direct connection (over the network) to the Exchange server.
This is why Outlook has cached mode enabled by default. In cached mode you are referencing your local cached copy (OST) file first before reference the Exchange server. This is the same a the GAL. When you are using cached mode you are not actually referencing the GAL but the Offline Address Book instead.
When using cached mode you will experience some delays in regards to GAL updates ect because you have to wait for the OAB to populate the new items when it updates (default is once a day).
Depending on the size of your mailbox is also important because if you have a very large mailbox (20+GB) you have a higher chance of OST corruption. So make sure that this is controlled using quotas.
Will.