PDF files open slowly in Outlook 2010 when connected to exchange remotely.

We have Exchange 2007 running on Windows SBS 2008.
We have been experiencing issues with attached PDF files opening very slowly from Outlook when roaming and connected remotely.
When in the office and connected to the LAN, the PDF attachments open fast.

My understanding is that this is because the outlook is referencing the exchange server mailbox to open the PDF when connected online, rather than just referencing the local OST for the downloaded email.
Is this correct?
Is there anything I can do to make the PDF attachments open quickly when connected remotely?
Barry KaySystems EngineerAsked:
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This is a known issue.

The workaround is to save the file to your computer and then open it.
No matter what happens with the OST file, the FIRST time you open the PDF file will usually be slow. The only way to solve that is to have better upload speed available at the server location (through the broadband provider).
It's easy to test, send a bigger PDF files. Someone outside (on the phone, to test real time). Let him open the PDF file (100% for sure slow). Let him close Outlook. Let him open the same PDF file. Now it's probably faster (OST caching is working!). If not (it opens the same slow speed), check if caching is enabled or not.
Of course, it also depends on how they're roaming, if it's a slow 3G dongle, then improving your upload speeds will have no effect.

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