Re: but also...
M!6 and GCHQ's evesdropping systems (see Snowden releases). They seem to have worked well.
There are others that I can't comment on as it would give the game away but I used to run a larger operation in a large whitehall dept that is still in house, still delivering massive solutions that touch all out lives but no-ones ever heard of. All Civil Servants, with some expert contractors as required.
The only time it goes tit's up is:
a) because it's being run for pennies and they won't even fund an A/C upgrade or UPS upgrades, let alone storage or servers: oldest servers are 8 years old (lots), youngest almost 5)
b) an outsourced provider fucks up the networking or gateways
c) the outsourced provider take over a year to package a simple desktop client - well still counting!
d) staff leave for far better paid jobs and can't be replaced because of recruitment freeze