Have you ever wondered how many objects You can create in Your DIT (actually this was showed some time ago by ~Eric) ? Or how many DC is to many in a domain?
For some time now on one of MS internal distribution groups group of folks were discussing document which describes such limits related to AD (BTW – possibility to be a part of such discussion is one of greatest things related to be an insider). This document is now published. It is short but provides all information, check it out – Active Directory Maximum Limits.
BTW – if this just happens that you are a customer who is near of such limit or had actually crossed it (if this is related to number of objects – call PSS 🙂 ) I would be happy to hear about it either through comments or through e-mail. So far I worked with one particular customer who has actually crossed one of such limits – this was about number of DCs in single domain. But this isn’t hard limit – is it more like recommendation and if You know how to handle this You can live with it.
So … another interesting reading.