Perhaps I'm just an old fogey, but passive voice feels like the only right choice:
"The site could not be found."
"Your computer is being updated."
The insertion of "We" feels like an imposition; the company who wrote the code reaching in and enacting their will with your equipment, using your screen as their soapbox. It's icky.
And without "we", there can of course be no "we apologize".
"We couldn't find that site."
"We're just updating your computer."
Perhaps I'm just an old fogey, but passive voice feels like the only right choice:
"The site could not be found."
"Your computer is being updated."
The insertion of "We" feels like an imposition; the company who wrote the code reaching in and enacting their will with your equipment, using your screen as their soapbox. It's icky.
And without "we", there can of course be no "we apologize".