I agree with Canuck. We have a few users who have had no contact time in the last few months; fortunately, we have enough CALs to make room for them (although I will occasionally email to find out why they aren't using their company-expensed handhelds and service plans).
It's worth noting (imo), though, that the Last Contact Time, in conjunction with Pending Messages, will be the true factor on deciding if a handheld is being used or not. RIM's calculations for the LCT is based solely on the last time a message was forwarded to/received by the handheld, which has nothing to do with when a message was sent.
Quote:
The Last Contact Time can be calculated with the following values:
Time Since Last Handheld Contact (LastContactTime)
Time the Last Message was Received by Handheld (LastFWDTime)
System clock (System Time)
LastContactTime = System Time - LastFWDTime
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