Outlook OST or PST File Question

[OliverShepherd]

I have Outlook 2007 that is currently working with MS Exchange at a hosted datacenter.  I will lose my Exchange access in a few days but I want to ensure that I still have access to the emails that are currently on my PC.  The files are located locally in an OST file (see attachment).
When I lose my Exchange access I assume I will still be able to access the emails that are located in the OST file.  Should I leave them there or move them to a PST file?
After I lose access to Exchange I will connect my Outlook to a POP email account and would like to have the two instances separate but accessible.
Appreciate all suggestions,
Thanks!

[Geek-9pm]

Have yo already seen this?
Introduction to Outlook Data Files (.pst and .ost)
Do not assume anything!
For your own peace of mind, backup the e-mail folders before the service stops. The general method is:
    Select File > Open & Export > Import/Export.
    Select Export to a file, and then select Next.
    Select Outlook Data File (.pst), and select Next.
    Select the mail folder you want to back up and select Next.
    Choose a location and name for your backup file, and then select Finish.
 Better safe than sorry.