Is your blackberry on BES? I assumed it is not from you original post. It sounds like you are using desktop manager to sync with Outlook both at work and at home. Is that the case?
If I understand you correctly and you are not on BES:
1 - Do a backup just to be safe. You shouldn't have a problem, but a backup is always wise.
2 - Open options > advanced options > service book
3 - Look for entries that start with an email address and end with CICAL in brackets and delete those. Do not delete anything else.
4 - Select close from the menu and repeat until you are back to your application or home screen.
5 - Perform a hard reset (remove the battery for 30+ seconds).
6 - After the device has finished booting, go back into options and see if the CICAL service books got pushed back. If not, see http://www.blackberryfaq.com/index.p...rvice_books%3F
But you should be able to resend servicebooks from the device from within the internet email setup wizard. If you don't see the link right off, look around, for example in help section.
You will have your separate calendars again after the service books are pushed to the device. I'm not 100% sure if your calendar entries from the past will still be separated or not. But I'm 99% sure you will be able to sync the calendar with Outlook again, so long as the default calendar and default messaging settings in options are the same.
If you are on BES, I'd rather not try and advise. It would proabably be better for you to talk to your admin anyway.