Are ActivityID's for windows Events ever re-used after a period of time or reboot?

[simoom]

What I want to do is summarize a completed transaction of ActivityID's like Windows updates.  However, I do not know if the ActivityID is reused again after a reboot and may not be a part of the original transaction or a period of time passes within 24 hours of my reports and the ActivityID is reused again.  Disclaimer, I do not know that much about Microsoft Events... so maybe this sounds all wrong?

[simoom]

Thank you. Though it might help someone new like me, never know.

[simoom · Accepted solution]

My mistake Correlation[]ActivityID... 

Looks like it is unique internal admin helped me out:

https://sharepoint.stackexchange.com/questions/9938/what-is-the-point-of-the-error-message-correlati...

[ITWhisperer]

This is really a Windows question not a Splunk question!