
"The US economy presented Sun with significant challenges in the third quarter," said chief executive Jonathan Schwartz in a statement.
Chief financial officer Michael Lehman warned that fourth-quarter sales would also be little changed, after previously predicting five per cent gains for the second half of the year.
Sun will be hoping that its US$1 billion acquisition of free-software maker MySQL in February will help bolster future revenue through software support and maintenance, as well as spurring server sales and storage to MySQL users.
Overall server shipments of 80,000 were up for the period, an increase of six percent on the same quarter a year ago.