Cached Mode in Exchange 2010

Hi Experts
We've been seeing an issue with the availability service on Exchange being extremely slow to bring back free/busy info for meetings where there are users in an external domain.
THis seems to be fixed if we use cached mode, rather than online mode.

I'm just wondering if there are any drawbacks to this?

We have dedicated PCs, so no "hotdesk" scenarios where an entire mailbox would be downloaded (OST file) to multiple PCs.

Thanks guys!
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Alexei KuznetsovMicrosoft Outlook MVPCommented:
Generally, cached mode is the preferred way to work with Exchange using desktop version of Outlook. Much more fast and convenient: you can access the cached data even if no Exchange connection available.
Will SzymkowskiSenior Solution ArchitectCommented:
When you use Cached mode it uses local resources on the desktop or laptop to work with Exchange. This is why it is more efficient when using cached mode oppose to Online mode. If you have a lot of users using Online mode this creates connections directly to Exchange which then uses the Exchange server resources to connect to Outlook. If you have a lot of users using Online mode then this puts more strain on the Exchange Resources, which can cause Outlook to slow down.

nashim khanExchange AdministratorCommented:

Please look this below article. It will help you to understand the same.

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