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Related: [Is it appropriate to use irasshaimase when welcoming someone to a
private office?](https://japanese.stackexchange.com/questions/44805/is-it-
appropriate-to-use-irasshaimase-when-welcoming-someone-to-a-private-
office/44808#44808)

In the related question, the target is "someone", which brings me to the
conclusion that OP there means "if anyone other than people working in the
same office arrives, should いらっしゃいませ be used?".

For example, when clients of a software engineering firm you're working for
visit your office, is it customary to say いらっしゃいませ since they are customers,
or is いらっしゃいませ usually just said in a service-oriented environment (such as
restaurants, hotels, and shops)?

Context: We have a Japanese HR Officer who happened to be in the same room as
us when the clients arrived and she greeted with いらっしゃいませ, which perplexed me
a bit because I thought it was only used for restaurants and whatnot.
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keigo business-japanese
Is it customary to say いらっしゃいませ in a corporate setting?
When someone comes to your place or office, you can say ようこそいらっしゃいました which is
basically "Welcome, nice to see you!" You can use this in your office and in
your home as well.
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> is いらっしゃいませ usually just said in a service-oriented environment (such as
> restaurants, hotels, and shops)?

Yes, it is.

I think it's not wrong in your office but a little weird.

"お待ちしておりました。(Omachisiteorimasita)" may be best for this situation.  
It means like "We(I) have been waiting for you."
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