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The Computer technician has an appointment to come to our place later this evening and it's 10 o'clock in the morning right now:

Which sentence should be used when I say this to my friend:

"The computer technician is coming later today." Or

"The computer technician will come later today." Or are they both ok and have the same meaning?
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Both are fine and synonymous. You might also say 'he is going to come later today'.
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PreciousJonesThe Computer technician has an appointment to come to our place later this evening and it's 10 o'clock in the morning right now:

Which sentence should be used when I say this to my friend:

"The computer technician is coming later today."

"The computer technician will come later today." Or are they both ok and have the same meaning?

I'd rather use this one " The computer technician is going to come later. But your sentences are fine as well.

The going to future is used to describe what someone wants or plans to do, usually in the near future.

while the will future is used to talk about future events over which the speaker has no control.

Wait for other opinions if you want to know the most suitable version.

Alex