Our company has a small amount of cement that is 5 years old, but it has been stored in steel drums and seems to be perfectly dry. There are only a few lumps, which were probably caused by the cement settling and thereby packing in the drums. We can easily reduce these few lumps to powder in the fingers. Would such cement be of adequate quality for normal use?
As long as it has not had access to moisture and has not formed partially hydrated lumps it is undoubtedly as good as it was when put in the drums. If you have any doubts you can have mortar test cubes made by a testing laboratory to determine its quality but it does not seem necessary in this case.