International information and communications technology group Datatec's revenues fell to $3.04 billion in the six months to the end of August from $3.29 billion last time.
EBITDA fell to $68.9 million (H1 FY16: $80.6 million) but gross margins improved to 13.8% from 13.1%.
Underlying earnings per share fell to 12.5 US cents from 16.6 US cents.
Chief executive Jens Montanana said: "The group's results for the first half of FY17 have been affected by challenging global conditions, with a strong US Dollar continuing to impact translated earnings. There are now however signs of improved confidence in emerging markets and we expect a continued slow recovery in these markets, with more stable currencies.
"Our multi-year investment in Westcon's transformation is entering its final stages with the ERP roll-out and BPO initiative expected to end by June 2017.
"Based on our strengthened position in key markets, we anticipate a sequentially and comparatively better second half of FY17."