Count service instances by multiple criteria

Dear Forum readers,

I have a problem i find a bit tricky to solve with Excel, but i am sure it should be possible.

I have a list of service interventions, every line contains amongst other data the following:
- Products Serialnumber (Unique value pr product, can appear several times if the unit has had several services within the timespan of the report (for instance 1 year)
- Service ID Code (Every service has one unique value)
- Service Closed Date

What i would like to see is if a specific serialnumber has had one or more services within a specific time periode (say 2 months)

I have been bending my mind a bit to try to figure this one out, maybe someone out there can come up with an way to solve it?


Best Regards
Robert