Outlook add-in freezing when Timer is enabled

We have an internally created add-in for Outlook 2003 that uses a timer.  For most people this is working fine.  A few users are using a third party add-in in addition to our internal one.  I have debugged our code and found that for thes users our internal add-in freezes outlook right after the Timer is enabled.  Given that I have no control over the other add-in, is there there anything I can do or change in our code to fix this?  Any ideas what the problem could be?
rkanterAsked:
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David LeeCommented:
Sorry, by language I didn't mean English, French, etc.  I meant programming language.

The problem appears to be confined to using the timer.  Since the timer code never gets executed the problem appears to have one of two causes.  One, timing of any kind in an Outlook add-in is a problem.  Two, the timer control itself is the problem.  The timer API offers a way to test that theory.  If it's the latter, then using the timer API would be a way around the problem.
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David LeeCommented:
What is the timer controlling?  What interval is it set for?  Could the add-in work without a timer?  What does the other add-in do?  My guess is that the timer code is firing and either taking too long to complete or creating a conflict of some sort.
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rkanterAuthor Commented:
Out add-in check to the calendar for certain items every few seconds.  The other addin is part of a product called Application Xtender from EMC that allows users to send emails to a document managements system to be archived.  I tried calling them but since I aleady know the application that is causing the conflict they were not willing to help.  
I put some debug code as the first line in the timer and it never gets executed.
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David LeeCommented:
Let me make sure I understand.  Everything works fine until you activate the timer in your add-in.  At that point Outlook hangs even though the timer's code is never executed.  Is that right?
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rkanterAuthor Commented:
Correct and only when the other add-in is enabled.  Also, I am not sure it is actually my code that is hanging Outlook.  The Application xtender add-in never finished loading either, as the menu option doesn't appear before Outlook freezes.  So if I disable either add-in Outlook works fine.  If I comment out the line in my add-in that enables to timer, then Outlook also loads fine.
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David LeeCommented:
What languageare using for the add-in?  If VB, is the timer an actual timer control?  Have you considered using the timer API instead?
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rkanterAuthor Commented:
English.  Yes I am using a control.  How would I use the API?
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rkanterAuthor Commented:
Why do you suggest the API over the control?
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